Payehghadr, M., H. Haghgoo Qezelje, F. Nourifard, A. Attaran, and M. Kalhor. “Preconcentration of Ultra-Traces of Cu(II) in Water Samples Using SBA-15 Sorbent Modified With a Thiocarbohydrazide Ligand Prior to Determination by Flame Atomic Absorption Spectrometry”. Journal of the Serbian Chemical Society, vol. 84, no. 5, June 2019, pp. 489-01, doi:10.2298/JSC180606093P.